Underwood Proof Marks

[damascusblade5]

I just bought an Underwood M1, stock and receiver numbers match, barrel is marked " Underwood 11 43 " with the bomb. I would like to know if the other proof marks are matching, the mag has IA , barrel band has AI , stock has O.G. on the left side, P-J in the sling well and PO on the bottom of the grip. I bought it from a friend who found it several years ago ,over the rafters of an old home he had bought. Any info would be greatly appreciated, I need to try to put a value on it. My pics are not good quality, had to use a cellphone.

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